NABL Accreditation for Diagnostic Labs in India: What It Means and How to Check It

If you’ve ever searched for a diagnostic lab in India, you’ve probably seen the words “NABL accredited” attached to a centre’s name.

It sounds reassuring. But there’s an important detail that often gets missed: NABL accreditation applies to a defined scope of work. It doesn’t automatically mean that every test, method or service offered by a centre sits inside that scope.

That distinction matters when you’re choosing a lab for a test that could affect a diagnosis or treatment decision.

What is NABL accreditation?

NABL stands for the National Accreditation Board for Testing and Calibration Laboratories. In India, it provides accreditation to medical laboratories against ISO 15189, the international standard covering quality and competence in medical laboratories.

The idea is fairly straightforward. A laboratory needs systems in place to produce reliable results consistently. That includes things such as competent staff, suitable equipment, controlled processes, records and quality checks.

NABL explains that it accredits medical laboratories against ISO 15189. It also makes clear that NABL itself does not perform the tests. It assesses laboratories against the relevant accreditation requirements. NABL’s official overview explains the accreditation framework in more detail.

Does NABL accreditation mean every test at the lab is accredited?

No.

This is probably the most useful thing to know before you book a test.

A laboratory’s accreditation has a defined scope. NABL’s own FAQ says that a laboratory’s capabilities are not necessarily all covered by its accreditation. Tests or capabilities that do not appear in the accredited scope are outside that NABL accreditation.

So, if a centre advertises dozens or hundreds of tests, don’t assume the NABL badge covers all of them.

The specific test matters.

How to check whether your test is covered

You can check this yourself through NABL’s laboratory search.

Start with the laboratory name and location. Then look for its accreditation details and, most importantly, the scope attached to its certificate.

NABL says users can search for an accredited medical laboratory and view the laboratory’s scope of accreditation. The scope can include details such as test parameters, methods and other technical information.

That sounds technical because it is. You don’t need to understand every line of it. The practical question is simpler:

Does the test I need appear within the laboratory’s accredited scope?

If you’re unsure, call the centre and ask them to confirm the test and the relevant accreditation scope before giving the sample.

What does a good laboratory quality system actually involve?

A quality lab is doing a lot of work before a number appears on your report.

The process starts before the sample reaches the analyser. Patient identification, sample collection, labelling, transport, storage, testing, result validation and reporting all matter.

The World Health Organization describes laboratory quality in terms of accuracy, reliability and timeliness. Its laboratory quality guidance also covers areas such as equipment, personnel, documentation, process control, assessment and information management. WHO’s laboratory quality management guidance provides the broader picture.

That’s why choosing a lab isn’t simply about finding the lowest price.

NABL vs NABH: are they the same thing?

No. They serve different purposes.

NABL is the accreditation body relevant to laboratories and other conformity assessment bodies, including medical testing laboratories under ISO 15189.

NABH is associated with accreditation of healthcare organisations and clinical services, such as hospitals and other healthcare facilities.

A hospital can therefore have NABH accreditation while its laboratory may have separate NABL accreditation. The two should not be treated as interchangeable labels.

Should you always choose a NABL-accredited lab?

For many laboratory tests, it is a sensible quality signal to look for.

But accreditation should be one part of the decision, not the whole decision. You still need to check whether the centre offers the test you need, whether the sample collection process suits you, how long the report is expected to take, and what the final price will be.

For repeat monitoring, consistency can matter too. If you regularly check the same marker, using the same laboratory and comparable testing conditions can make your results easier for your doctor to assess over time.

If you’re comparing centres, our guide on how to choose a diagnostic centre in Bangalore covers the practical checks worth making before booking.

You can also use Locatemycentre to find diagnostic centres, pathology labs and scan centres across India, then check the centre details before you call or visit.

What should you ask a diagnostic centre before booking?

You don’t need a long checklist. Four questions will usually get you most of the useful information:

1. Is this test available at this centre?
2. Is this particular test covered by your NABL accreditation scope?
3. When will I receive the report?
4. What is the final price, including any sample collection or home-visit charge?

If the centre cannot give you a clear answer about the test or price, it’s reasonable to compare another option.

What if the lab is not NABL accredited?

The absence of NABL accreditation does not, by itself, prove that a laboratory produces unreliable results.

Accreditation is one way of assessing a laboratory’s quality system. Other factors can matter too, including the laboratory’s processes, staff, equipment, quality controls and the specific test being performed.

Still, if accreditation is important for your situation, verify it rather than relying on a logo printed on a website, brochure or collection-centre sign.

NABL provides an official search and allows users to inspect accreditation scope. That is a much stronger check than taking a marketing claim at face value. Check NABL’s official laboratory search guidance.

A final practical point

The cheapest lab is not automatically the smartest choice. And the biggest brand is not automatically the right one either.

Look at the test. Check the accreditation scope. Confirm the collection process and price. Then decide.

That small bit of homework can save you from a repeat sample, an unexpected bill or, in some cases, a result that needs unnecessary follow-up.

Frequently asked questions

Is NABL accreditation mandatory for every diagnostic lab in India?

NABL accreditation is an accreditation system for laboratories; it should not be treated as a universal claim that every diagnostic facility must carry a NABL certificate. If accreditation matters for your test, verify the laboratory’s current status and scope directly through NABL.

How can I verify a NABL-accredited laboratory?

Use NABL’s official laboratory search and check the laboratory’s certificate and scope of accreditation. Don’t stop at the NABL logo on a centre’s website.

Does NABL accreditation cover all tests offered by a lab?

No. Accreditation is tied to a defined scope. A laboratory can offer tests that are outside its NABL-accredited scope, so check the specific test you need.

Is NABL the same as ISO 15189?

No. ISO 15189 is the international standard for quality and competence in medical laboratories. NABL is the Indian accreditation body that provides accreditation to medical laboratories against the relevant standard.

Is a NABL-accredited lab always the best choice?

NABL accreditation is a useful quality indicator, but it should not be the only factor. Consider the test, accreditation scope, sample collection process, turnaround time, location and total price before choosing a centre.

This article is for general information and does not replace advice from a qualified healthcare professional. Test selection and interpretation should be based on your individual clinical situation and your doctor’s advice.